// Copyright (c) EZSCALE.
// SPDX-License-Identifier: MPL-2.0

package provider

import (
	"context"
	"encoding/json"
	"fmt"

	"terraform-provider-virtfusion/internal/client"

	"github.com/hashicorp/terraform-plugin-framework/datasource"
	"github.com/hashicorp/terraform-plugin-framework/datasource/schema"
	"github.com/hashicorp/terraform-plugin-framework/types"
)

var (
	_ datasource.DataSource              = &PackagesDataSource{}
	_ datasource.DataSourceWithConfigure = &PackagesDataSource{}
)

// NewPackagesDataSource returns a new packages data source.
func NewPackagesDataSource() datasource.DataSource {
	return &PackagesDataSource{}
}

// PackagesDataSource defines the data source implementation.
type PackagesDataSource struct {
	client *client.Client
}

// PackagesDataSourceModel describes the data source data model.
type PackagesDataSourceModel struct {
	Results  types.Int64        `tfsdk:"results"`
	Packages []PackageItemModel `tfsdk:"packages"`
}

// PackageItemModel describes a single package in the list.
type PackageItemModel struct {
	ID                   types.Int64  `tfsdk:"id"`
	Name                 types.String `tfsdk:"name"`
	Enabled              types.Bool   `tfsdk:"enabled"`
	CPUCores             types.Int64  `tfsdk:"cpu_cores"`
	Memory               types.Int64  `tfsdk:"memory"`
	Storage              types.Int64  `tfsdk:"storage"`
	Traffic              types.Int64  `tfsdk:"traffic"`
	NetworkSpeedInbound  types.Int64  `tfsdk:"network_speed_inbound"`
	NetworkSpeedOutbound types.Int64  `tfsdk:"network_speed_outbound"`
	Ipv4                 types.Int64  `tfsdk:"ipv4"`
}

func (d *PackagesDataSource) Metadata(_ context.Context, req datasource.MetadataRequest, resp *datasource.MetadataResponse) {
	resp.TypeName = req.ProviderTypeName + "_packages"
}

func (d *PackagesDataSource) Schema(_ context.Context, _ datasource.SchemaRequest, resp *datasource.SchemaResponse) {
	resp.Schema = schema.Schema{
		MarkdownDescription: "Fetches all VirtFusion packages.",
		Attributes: map[string]schema.Attribute{
			"results": resultsSchemaAttribute(),
			"packages": schema.ListNestedAttribute{
				MarkdownDescription: "List of packages.",
				Computed:            true,
				NestedObject: schema.NestedAttributeObject{
					Attributes: map[string]schema.Attribute{
						"id": schema.Int64Attribute{
							MarkdownDescription: "The package ID.",
							Computed:            true,
						},
						"name": schema.StringAttribute{
							MarkdownDescription: "The package name.",
							Computed:            true,
						},
						"enabled": schema.BoolAttribute{
							MarkdownDescription: "Whether the package is enabled.",
							Computed:            true,
						},
						"cpu_cores": schema.Int64Attribute{
							MarkdownDescription: "The number of CPU cores in the package.",
							Computed:            true,
						},
						"memory": schema.Int64Attribute{
							MarkdownDescription: "The amount of memory in the package.",
							Computed:            true,
						},
						"storage": schema.Int64Attribute{
							MarkdownDescription: "The amount of storage in the package.",
							Computed:            true,
						},
						"traffic": schema.Int64Attribute{
							MarkdownDescription: "The traffic limit in the package.",
							Computed:            true,
						},
						"network_speed_inbound": schema.Int64Attribute{
							MarkdownDescription: "The inbound network speed in the package.",
							Computed:            true,
						},
						"network_speed_outbound": schema.Int64Attribute{
							MarkdownDescription: "The outbound network speed in the package.",
							Computed:            true,
						},
						"ipv4": schema.Int64Attribute{
							MarkdownDescription: "The number of IPv4 addresses in the package.",
							Computed:            true,
						},
					},
				},
			},
		},
	}
}

func (d *PackagesDataSource) Configure(_ context.Context, req datasource.ConfigureRequest, resp *datasource.ConfigureResponse) {
	if req.ProviderData == nil {
		return
	}

	c, ok := req.ProviderData.(*client.Client)
	if !ok {
		resp.Diagnostics.AddError(
			"Unexpected Data Source Configure Type",
			fmt.Sprintf("Expected *client.Client, got: %T.", req.ProviderData),
		)
		return
	}

	d.client = c
}

func (d *PackagesDataSource) Read(ctx context.Context, req datasource.ReadRequest, resp *datasource.ReadResponse) {
	var data PackagesDataSourceModel

	rawResp, err := d.client.GetAllPages(ctx, fmt.Sprintf("/packages?%s", resultsQueryParam(data.Results)))
	if err != nil {
		resp.Diagnostics.AddError("Error Reading Packages", err.Error())
		return
	}

	var listResp client.PackageListResponse
	if err := json.Unmarshal(rawResp, &listResp); err != nil {
		resp.Diagnostics.AddError("Error Parsing Packages Response", err.Error())
		return
	}

	data.Packages = make([]PackageItemModel, len(listResp.Data))
	for i, p := range listResp.Data {
		data.Packages[i] = PackageItemModel{
			ID:                   types.Int64Value(p.ID),
			Name:                 types.StringValue(p.Name),
			Enabled:              types.BoolValue(p.Enabled),
			CPUCores:             types.Int64Value(p.CPUCores),
			Memory:               types.Int64Value(p.Memory),
			Storage:              types.Int64Value(p.Storage),
			Traffic:              types.Int64Value(p.Traffic),
			NetworkSpeedInbound:  types.Int64Value(p.NetworkSpeedInbound),
			NetworkSpeedOutbound: types.Int64Value(p.NetworkSpeedOutbound),
			Ipv4:                 types.Int64Value(p.Ipv4),
		}
	}

	resp.Diagnostics.Append(resp.State.Set(ctx, &data)...)
}